TOKYO, JAPAN

Contacts: Mr. Norio Igawa Research and Development Institute Takenaka corporation 2-5-14 Minamisuna, Koto Tokyo 136, Japan Tel : (81) 33 647 3161 Fax : (81) 33 645 0911 E-mail : igawa@ccm.rdi.takenaka.co.jp Server :	Station Location: Tokyo, Japan. Latitude: 35°50' N Longitude: 139°49' E Height above sea level: 22 m. Local Time: GMT+9 Code: JPN10 Type: Research class. Operation: started on March 1, 1992.
Topographic map showing the land within a 5 km radius of the station location

TOKYO, JAPAN

Site surroundings: The station is located 5 km east of Tokyo. Within a 5 km radius of the station, on the west, the land is almost only a business area and on the other side is business and housing area. 3 km south is Tokyo bay.	Climate characteristics: Climate is temperate maritime with mild winters and slightly hot summers. Average annual temperature is 15.6 °C. Average temperature in January is 5.2 °C and in July 25.2 °C. Average annual sunshine duration is 1811 hours. Average annual number of rainy days (>1mm/day) is 99. The closest weather station is located in Chiyoda, 6 km west of Tokyo.
Map showing the immediate surroundings of the station

TOKYO, JAPAN

Sampling Interval: 1 mn. (15 mn for sky scans) Recording Interval: 1 mn. (15 mn for sky scans) Illuminances: Global horizontal: EKO ML-010S Diffuse horizontal: EKO ML-010S North vertical: EKO ML-010S East vertical: EKO ML-010S South vertical: EKO ML-010S West vertical: EKO ML-010S Direct normal: EKO ML-010SD Irradiances: Global horizontal: EKO MS-801 Diffuse horizontal: EKO MS-801 North vertical: EKO MS-801 East vertical: EKO MS-801 South vertical: EKO MS-801 West vertical: EKO MS-801 Direct normal: EKO MS-52 Others: Sky luminances: EKO MS-300 Sky radiances: EKO MS-300 Dry bulb temperature: EKO MT-020S Dew-point temperature: EKO MH-030 Shadow band specifications: Diffuse illuminance: (self made : automatic ally controlled) radius: 50.0 cm / width: 5.0 cm Diffuse irradiance: (self made : automatic ally controlled) radius: 50.0 cm / width: 5.0 cm

Station map Obstruction for the global horizontal illuminance sensor

Comments The vertical sensors are shaded from ground reflected light using a black punched metal. The sun tracker is controlled every 2 seconds by the computer. The positions of the shade rings are adjusted automatically by the computer. All the sensors were calibrated in January 1992 by EKO.

TOKYO, JAPAN

View 1 of the station	Comments This view of the station is looking toward north. The diffuse illuminance sensor can be seen on the left. The irradiance sensor can be seen on the right. The north vertical illuminance, the irradiance sensors and the sky scanner can be seen in the center.
View 2 of the station	Comments This view of the station is looking toward south. The global horizontal irradiance and the sunshine duration sensors can be seen on the left. The global illuminance and the zenith luminance sensors can be seen on the right. The direct illuminance and irradiance sensors on the sun tracker and the south vertical illuminance and irradiance sensors can be seen in the center.

TOKYO, JAPAN

Important modifications made to the acquisition system, recording interval modification, time during which the station was not operating...

Date

Comments